90 F + 70% Humidity, Humid Summer Day
Audience: Anyone outdoors more than 30 minutes
Air Temp
90°F
32°C
Humidity
70%
Heat Index
106°F
41°C
Risk band
Danger
What this means
Heat cramps and heat exhaustion likely with prolonged exposure or activity. The body's sweat evaporation slows in high humidity, so the felt temperature jumps 16 F above the actual.
What to do
Limit outdoor activity to early morning or after sunset. Wear light, loose clothing. Watch for nausea, dizziness, headache, those are exhaustion signs.
Source
NWS Heat Index ChartOther Danger scenarios
Not medical advice. The NWS Steadman heat index is a general guideline; individual heat tolerance varies with acclimatization, medications, and pre-existing conditions. Consult a medical professional for individual risk assessment.